Should numpy.sqrt(-1) return 1j rather than nan?

[David Goldsmith]

Travis Oliphant wrote:
>
> This is the one that concerns me.  Slowing everybody down who knows they 
> have positive values just for people that don't seems problematic.
>
>   
Then have a "sqrtp" function for those users who are fortunate enough to 
know ahead of time that they'll only be talking square roots of 
nonnegatives.

DG


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